* {
  margin: 0;
  padding: 0;
}
body {
  min-height: 100vh;
  /* 弹性布局 居中 */
  display: flex;
  justify-content: center;
  align-items: center;
  background-color: #94bfb560;
}
.container {
  background-color: #222;
  width: 350px;
  height: 550px;
  border-radius: 15px;
  overflow: hidden;
  position: relative;
}
.container::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  right: 0;
  background: url(../../images/views/bg.jpg) no-repeat;
  background-size: 500px;
  background-position: left bottom;
  opacity: 0.8;
}
/* 注册区域（登录区域很多样式和注册区域的一样，故而一些统一的样式写在了一起） */
.register-box {
  width: 70%;
  position: absolute;
  z-index: 1;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  transition: 0.3s ease;
}
.register-title,
.login-title {
  color: #fff;
  font-size: 27px;
  text-align: center;
}
.register-title span,
.login-title span {
  color: rgba(0, 0, 0, 0.4);
  display: none;
}
.register-box .input-box,
.login-box .input-box {
  background-color: #fff;
  border-radius: 15px;
  overflow: hidden;
  margin-top: 50px;
  opacity: 1;
  visibility: visible;
  transition: 0.6s ease;
}
.register-box input,
.login-box input {
  width: 100%;
  height: 30px;
  border: none;
  border-bottom: 1px solid rgba(0, 0, 0, 0.1);
  font-size: 12px;
  padding: 8px 0;
  text-indent: 15px;
  outline: none;
}
.register-box input:last-child,
.login-box input:last-child {
  border-bottom: none;
}
.register-box input::placeholder,
.login-box input::placeholder {
  color: rgba(0, 0, 0, 0.4);
}
.register-box button,
.login-box button {
  width: 100%;
  padding: 15px 45px;
  margin: 15px 0;
  background: rgba(0, 0, 0, 0.4);
  border: none;
  border-radius: 15px;
  color: rgba(255, 255, 255, 0.8);
  font-size: 13px;
  font-weight: bold;
  cursor: pointer;
  opacity: 1;
  visibility: visible;
  transition: 0.3s ease;
}
.register-box button:hover,
.login-box button:hover {
  background-color: rgba(0, 0, 0, 0.8);
}
/* 登录区域 */
.login-box {
  position: absolute;
  inset: 0;
  top: 20%;
  z-index: 2;
  background-color: #fff;
  transition: 0.3s ease;
}
.login-box::before {
  content: "";
  background-color: #fff;
  width: 200%;
  height: 250px;
  border-radius: 50%;
  position: absolute;
  top: -20px;
  left: 50%;
  transform: translateX(-50%);
}
.login-box .center {
  width: 70%;
  position: absolute;
  z-index: 3;
  left: 50%;
  top: 40%;
  transform: translate(-50%, -50%);
}
.login-title {
  color: #000;
}
.login-box .input-box {
  border: 1px solid rgba(0, 0, 0, 0.1);
}
.login-box button {
  background-color: #75a297;
}
/* 注册、登录区域收起 */
.login-box.slide-up {
  top: 90%;
}
.login-box.slide-up .center {
  top: 10%;
  transform: translate(-50%, 0%);
}
.login-box.slide-up .login-title,
.register-box.slide-up .register-title {
  font-size: 16px;
  cursor: pointer;
}
.login-box.slide-up .login-title span,
.register-box.slide-up .register-title span {
  margin-right: 5px;
  display: inline-block;
}
.login-box.slide-up .input-box,
.login-box.slide-up .button,
.register-box.slide-up .input-box,
.register-box.slide-up .button {
  opacity: 0;
  visibility: hidden;
}
.register-box.slide-up {
  top: 6%;
  transform: translate(-50%, 0%);
}
